Stainless Steel Hard Chrome Plated Piston Rods are mainly used in hydraulic pneumatics, engineering machinery, and automobile manufacturing piston rods. The piston rod is processed by rolling. Since the surface layer has residual compressive stress on the surface, it helps to close the micro cracks on the surface and hinders the expansion of erosion. Thereby improving the corrosion resistance of the surface, and delaying the occurrence or expansion of fatigue cracks, thus improving the fatigue strength of the cylinder rod. Through rolling forming, a layer of cold hardening layer is formed on the rolling surface, which reduces the elastic and plastic deformation of the contact surface of the grinding pair, thereby improving the wear resistance of the surface of the cylinder rod and avoiding burns caused by grinding. After rolling, the reduction in surface roughness values improves fit properties. At the same time, the friction damage to the sealing ring or the sealing member during the movement of the cylinder rod piston is reduced, and the overall service life of the oil cylinder is improved. The rolling process is a high-efficiency and high-quality process measure. The rolling head (45 steel seamless steel pipe) with a diameter of 160mm is used as an example to prove the rolling effect. After rolling, the surface roughness of the cylinder rod decreases from Ra3.2~6.3um before rolling to Ra0.4~0.8um, the surface hardness of the cylinder rod increases by about 30%, and the surface fatigue strength of the cylinder rod increases by 25%. The service life of the oil cylinder is increased by 2~3 times, and the efficiency of the rolling process is increased by about 15 times compared with the grinding process. The above data shows that the rolling process is efficient and can greatly improve the surface quality of the cylinder rod.
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